Radio system which overcomes signal interference from clock oscillation circuit

Abstract

A radio system has a transmitting circuit for tuning in a transmitting frequency at a desired frequency, a control circuit for performing control of the whole of the radio system, a clock oscillation circuit operative to generate a reference clock for the control circuit, a memory circuit operative to store conditions for switching the oscillation frequency of the reference clock to be generated by the clock oscillation circuit, a comparative arithmetic circuit for comparing a transmitting frequency tuned in by the transmitting circuit with the conditions stored in the memory circuit, and a frequency switching circuit for switching the oscillation frequency of the reference clock to be generated by the clock oscillation circuit, on the basis of a result of comparison by the comparative arithmetic circuit. The oscillation frequency of the reference clock to be generated by the clock oscillation circuit is switched by controlling the frequency switching circuit on the basis of a result of comparison by the comparative arithmetic circuit.

What is claimed is:  
     
       1. A radio system comprising: 
       transmitting means for tuning in a transmitting frequency at a desired frequency;  
       control means for performing control of a whole of said radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means operative to store conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means;  
       comparative arithmetic means for comparing said transmitting frequency tuned in by said transmitting means with the conditions stored in said memory means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of a result of comparison by said comparative arithmetic means,  
       wherein said frequency switching means is controlled using a result of comparison by said comparative arithmetic means, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means.  
     
     
       2. A radio system comprising: 
       receiving means for tuning in a receiving frequency at a desired frequency;  
       control means for performing control of a whole said radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means operative to store conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means;  
       comparative arithmetic means for comparing said receiving frequency tuned in by said receiving means with the conditions stored in said memory means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of a result of comparison by said comparative arithmetic means,  
       wherein said frequency switching means is controlled using a result of comparison by said comparative arithmetic means, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means.  
     
     
       3. A radio system comprising first and second sub-radio systems, said first sub-radio system including: 
       transmitting means for tuning in a transmitting frequency at a desired frequency;  
       control means for performing control of a whole of said first sub-radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means operative to store conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means;  
       comparative arithmetic means for comparing said transmitting frequency tuned in by said transmitting means with the conditions stored in said memory means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of a result of comparison by said comparative arithmetic means,  
       wherein said frequency switching means is controlled using a result of comparison by said comparative arithmetic means, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means,  
       said second sub-radio system including:  
       receiving means for tuning in a receiving frequency at a desired frequency;  
       control means for performing control of a whole of said second sub-radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means operative to store conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means;  
       comparative arithmetic means for comparing said receiving frequency tuned in by said receiving means with the conditions stored in said memory means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of a result of comparison by said comparative arithmetic means,  
       wherein said frequency switching means is controlled using a result of comparison by said comparative arithmetic means, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means.  
     
     
       4. A radio system comprising: 
       transmitting means for tuning in a transmitting frequency at a desired frequency;  
       control means for performing control of a whole of said radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means for storing transmitting frequencies to be tuned in by said transmitting means and conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of the conditions stored in said memory means,  
       wherein said transmitting means tunes in one of said transmitting frequencies stored in said memory means, said frequency switching means is controlled on the basis of one of said conditions stored in said memory means and corresponding to said one of said transmitting frequencies, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means.  
     
     
       5. A radio system comprising: 
       receiving means for tuning in a receiving frequency at a desired frequency;  
       control means for performing control of a whole of said radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means for storing receiving frequencies to be tuned in by said receiving means and conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of the conditions stored in said memory means,  
       wherein said receiving means tunes in one of said receiving frequencies stored in said memory means, said frequency switching means is controlled on the basis of one of said conditions stored in said memory means and corresponding to said one of said receiving frequencies, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means.  
     
     
       6. A radio system comprising first and second sub-radio systems, said first sub-radio system including: 
       transmitting means for tuning in a transmitting frequency at a desired frequency;  
       control means for performing control of a whole of said first sub-radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means for storing transmitting frequencies to be tuned in by said transmitting means and conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of the conditions stored in said memory means,  
       wherein said transmitting means tunes in one of said transmitting frequencies stored in said memory means, said frequency switching means is controlled on the basis of one of said conditions stored in said memory means and corresponding to said one of said transmitting frequencies, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means,  
       said second sub-radio system including  
       receiving means for tuning in a receiving frequency at a desired frequency;  
       control means for performing control of a whole of said second sub-radio system;  
       clock oscillation means, comprising a variable capacitance diode, operative to generate a reference clock for said control means;  
       memory means for storing receiving frequencies to be tuned in by said receiving means and conditions for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means; and  
       frequency switching means for switching the oscillation frequency of the reference clock to be generated by said clock oscillation means, on the basis of the conditions stored in said memory means,  
       wherein said receiving means tunes in one of said receiving frequencies stored in said memory means, said frequency switching means is controlled on the basis of one of said conditions stored in said memory means and of said receiving frequencies, and the oscillation frequency of the reference clock to be generated by said clock oscillation means is switched in accordance with a state of an output of said frequency switching means.